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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f17ff8cfaf692671122f1556507162298b3388b9bdcc910cbc560a51ebbfdf5' 
  AND token = 'V9K0WDs20gR3O9tnl80Q2ORnD/4A2rclavE8tiKmC8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}